P2603

P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2603-768: Coolant Pump Control Circuit High

DTC P2603-768 - Coolant Pump Control Circuit High

DESCRIPTION
HINT: This is the repair procedure for the "oil pump control circuit".

The HV control ECU detects the Generator and Motor temperature through signals from the generator and motor temperature sensors and activates the oil pump relay and oil pump driver (oil pump w/ motor assembly).
The HV control ECU monitors OPST signals from the oil pump driver and detects a malfunction.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- When troubleshooting the oil pump w/ motor assembly, check for the following conditions.

- ATF temperature inside the oil cooler is 41 °F (5°C) or more.
- Value of the ambient temperature sensor is 41 °F (5°C) or more.

PROCEDURE

1. INSPECT OIL PUMP FUSE
(a) Remove the oil pump fuse from the engine room R/B No.4.





(b) Check continuity of the oil pump fuse.
OK:
There is continuity.
NG -- REPLACE OIL PUMP FUSE
OK -- Continue to next step.
2. INSPECT OIL PUMP RELAY
(a) Remove the oil pump relay from the engine room R/B No.4.





(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE OIL PUMP RELAY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP RELAY, OIL PUMP RELAY - OIL PUMP)
(a) Remove the oil pump relay from the engine room R/B No.4.





(b) Disconnect the O9 oil pump w/ motor assembly connector.
(c) Disconnect the H34 HV control ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):






Standard Resistance (Check for short):





(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):






Standard Resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP)
(a) Disconnect the O9 oil pump w/ motor assembly connector.





(b) Disconnect the H34 HV control ECU connector.
(c) Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.
Standard Voltage:





(d) Turn the ignition switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT HYBRID VEHICLE CONTROL ECU
(a) Remove the oil pump relay from the engine room R/B No.4.





(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Select the following menu items: Powertrain / Hybrid Control / Active Test / Inspection Mode-2WD Inspection.
(e) Put the vehicle into the READY-on state.
(f) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





(g) Turn the ignition switch off.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- REPLACE OIL PUMP W/ MOTOR ASSEMBLY